Phenolic novolak resin for shell mold, process for producing...

Details Phenolic novolak resin for shell mold, process for producing... Phenolic novolak resin for shell mold, process for producing...

2008-02-29

2009-08-25

Kiliman, Leszek (Department: 1794)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

C428S331000, C428S403000, C428S404000, C428S406000, C428S407000, C523S139000, C523S145000, C523S201000

Reexamination Certificate

active

07579075

ABSTRACT:
It is an object of the present invention to provide a phenolic novolak resin for a shell mold which is capable of simultaneously solving a problem of gas defect caused by a tar generated at the time of casting and a problem of a casting defect represented by veining. As the phenolic novolak resin in RCS for the shell mold, there is used a copolycondensation resin-type phenolic novolak resin obtained by reacting a phenol and an alkylphenol, with at least one of aldehydes, wherein a ratio of an ortho-bond to a para-bond of a methylene group in the phenolic novolak resin is not less than 1.5, and a fire-resisitant particle is coated with this resin.

REFERENCES:
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patent: 2001-321883 (2001-11-01), None
patent: 2002-102999 (2002-04-01), None
patent: 2002-102999 (2002-04-01), None

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